n various technical fields it can be observed that younger versions of the respectively used technical devices or components thereof always have smaller spatial dimensions and this with the same or even better performance. This phenomenon is called “miniaturization”. In the course of an investigation , a measure size for quantification of the miniaturization of hard discs was needed , but was not found despite intensive search. A project “Quantification of miniaturization” was started and a measure size has been developed: “Miniaturization degree” mD . The new measure size is presented here. mD has proved to be very versatile, is easy to handle and can quantify miniaturization well. The application of mD is illustrated by examples (hard disc, File server). In a further study the question of whether there is a limit of miniaturization of hard disks is investigated. Although the need for this tool arised from computer problems, its applicability is not limited to this. It can also be applied to many miniaturization questions in other areas of technology.
